21500134763411 has 4 divisors (see below), whose sum is σ = 22241518720800. Its totient is φ = 20758750806024.

The previous prime is 21500134763357. The next prime is 21500134763431. The reversal of 21500134763411 is 11436743100512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21500134763411 - 2¹⁴ = 21500134747027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500134763431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370691978651 + ... + 370691978708.

It is an arithmetic number, because the mean of its divisors is an integer number (5560379680200).

Almost surely, 2^{21500134763411} is an apocalyptic number.

21500134763411 is a deficient number, since it is larger than the sum of its proper divisors (741383957389).

21500134763411 is an equidigital number, since it uses as much as digits as its factorization.

21500134763411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741383957388.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 21500134763411 its reverse (11436743100512), we get a palindrome (32936877863923).

The spelling of 21500134763411 in words is "twenty-one trillion, five hundred billion, one hundred thirty-four million, seven hundred sixty-three thousand, four hundred eleven".